Academic literature on the topic 'Arbetsstudie'

Examensarbetet har genomförts på SB Truck AB i Vreta Kloster. Tyngdpunkten i arbetet var att filma tillverkningen av en ståstaplartruck,för att sedan analysera tillverkningsmetoderna och räkna fram den totala tiden för tillverkningen av en typ av truck. I studien ges förslag på förbättringar av tillverkningsmetoderna. Förslagen berör främst huvuddelarna i produktionen som är mast-, chassi- och gaffelvagnstillverkning. De förslag på förändringar som är viktigast är följande:

- Kontrollera vilka svetsfogar som verkligen behöver slipas.

- Se till att mastbalkarna som köps in håller den tolerans på rakhet som krävs.

This thesis has been carried out at SB Truck AB in Vreta Kloster. The emphasis of the project was to capture the manufacturing of a forklift on tape, to be able to analyse the manufactoring methods and calculate the total time of manufactoring. The project contains suggestions for improvements of the manufactoring methods. The suggestions mainly deals with the vital parts in the production process of the forklift. The most important suggestions are:

- Determine which of the weldingjoints that really needs to be grinded.

- Make sure that the purchased girders reaches the required tolerance level of straightness.

The company is currently in a stage of improvement and has therefore taken the help of students at School of Engineering, Jonkoping University. The current production is batch, production layout is fixed. A bottleneck is created after the first station which leads to large efficiency loss.  

The meaning of this report was to provide a layout suggestion with balanced workstations to a new production line. The conditions were that the production line would be one-way, driven by customers order and meet a demand of 40 products per week.  

In order to achieve a result, different methods and tools have been used, these have been time studies, video recording, case studies and interviews with assemblers and supervisor. Theoretical background has been helpful for the choice of methods and work implementation.  

The result of this work was a series of solutions based on the company’s strategy and the methods that has been used. Solution A uses three stations with the idea to create a suction through the flow and smooth line balancing. Solution B also had three stations with the basic concept to be able to adjust the number of stations. The number of stations can be selected when the demand change between two, three or six stations. The last Solution C meaning was to create a production line where the operations of the same character had their own place. This solution has five stations, creating a large efficiency loss.  

The conclusion is that Layout proposal B is best for the company. This is because it is the most flexible proposal when it is possible to adapt to a demand from 20- 100 products /week. Proposal for methods development and opportunities for improvement in production can be found in the conclusion and discussion. 

The aim of this report is to analyse the use of the capacity at the CNC (computer numerical control) cutters and show how the level of set up time for these cutters at Stålöv AB. This assignment is concrete whereas there are no subjective questions to this matter and there are only cold figures presented.

Production economy is getting more important as the competition hardens and there are several different ways to increase productivity and efficiency in a company. In order to increase productivity and efficiency work studies are used to, through an analysis, find developments in methods that result in improved work methods and to establish the time that are used. Increased production of different parts and customer driven production in combination with increased demands on rationalisation of capital have led to an enlarged interest for shorter set up times in the production.

To point out the use of capacity and the set up time of the cutters at Stålöv AB we used frequency studies. Frequency studies are work measure methods based on random observations on predetermined events to calculate the relative occurrence of these events. The purpose is to present the objective cold figures that show the use of capacity for all machines and totally.

The compilation of the seven CNC cutters shows that the use of capacity reaches 33 %. The lack of machine operators is the single largest reason, 45 % of the total use of capacity. The set up time reaches 6 % totally of the 36 hours of observation of the machines.

The study of the separate CNC cutters shows that the result follows the result of the compilation of all machines; the main reason why the use of capacity is low depends on the lack of machine operators. This means that if the demand increases there will not be enough operators to meet this demand.

If using SMED, the set up time percentage share of the total use of capacity are too large, but the production of prototypes that supplies great value to the company may justify the set up times.

By using Total Productive Maintenance (TPM), based on the elimination of breakdowns and defective products, the stability in production and the use of capacity may increase.